i came across a few forums already claims that it's better to do biceps with back day since they already pumped doing back and you can add some curls to finich the biceps,and the same goes to triceps
i was thinking didn't you already used your biceps energy in back workout and you wont be able to put your all effort in bicep specific exercise?
i hope you get what i mean..
i'm currently doing back/biceps and chest/tri,been thinking to change things up a little bit,maybe...